I will be interested to know the approach for this as well. THanks. On Wednesday, 27 August 2014 18:48:10 UTC+5:30, Graham Ashton wrote: > > Hi. I could do with a bit of help getting a list of tags (as defined by my > app's users) that match the text they've already typed. > > When a user starts typing the name of a tag I want to suggest the names of > all the tags that contain the string that they've typed. If some of my > documents are tagged with "foo", "bar" or "foo-bar" I'd like to suggest: > > 1. "foo" and "foo-bar" if they type "fo", or > 2. "bar" and "foo-bar" if they type "ba" > > I've put all the data, mappings, queries and index settings in this gist: > https://gist.github.com/gma/caef19e6271aec0f9e56 > > tl;dr - I'd like to remove the `"key": "bar"` bucket from results.js. > > Here's the long version. > > I've seen the Completion Suggester, but as I understand it, it won't cope > with (2). > > So I've started down the route of indexing my tags as ngrams, as described > in the Definitive Guide. Searching on the ngrams works really well for > suggesting documents that have been tagged with a given tag (e.g. "fo" > finds "foo-bar", etc.), but... > > ...I want to return to the user a list of tags, rather than a list of > documents that are tagged with a tag that contains the ngram the user has > typed in. > > I asked how to do this on IRC a while ago, and @dadoonet said I needed > "term aggregation" (thanks!). I've now got a query that scopes my > aggregation so that I can search for tags by ngrams. > > I've actually indexed the tags on my documents twice; once with the > whitespace analyzer, and once with a custom analyzer that sets up ngram > indexing. > > It works fine until a document is tagged with multiple tags. If I tag a > document with "foo" and "bar", both those tags are returned when I search > for tags that contain the ngram "fo". > > Why? The aggregation finds all documents that have a tag containing the > ngram "fo", and then returns all the tags on that set of documents. > > Is there any way I can filter the buckets returned, so that I only get > buckets whose keys match the ngram I've searched for? Or am I approaching > this all wrong... > > I'm using Elasticsearch 1.2.1, Java 7, and have been running these tests > on my development machine. > > Thanks in advance! > > Graham > > P.S. The Definitive Guide is superb - it makes Elasticsearch the most > thoroughly documented open source project I've tried learning in many years. >
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